Get a nifty fifty (50mm prime lens)and use it wide open. Well, just get ANY lens you can that can have a wide aperture. Also, bump up your ISO to higher than you'd normally use. I say these things because to shoot moving bowlers, you'll need a fast shutter speed, like 1/180 and up, if it's possible. And light will probably not be in abundance.

On that note I actually shot in a bowling alley recently. To my dismay it was a 'glow bowl' night so there was literally NO white light in that *$&#)## place. I left my fifty at home. Duuummmmbbbb Any who, i had my sigma 28-80. I managed to shoot at my widest aperture at 28mm f/3.3.... maybe. I was still able to keep a shutter of about 1/120 - 1/180 and my iso around 400. It turned out alright. I'd post some of the pics but I'm in class at the moment.